US20050199096A1 - Method for manufacturing an inner cutter for an electric shaver - Google Patents

Method for manufacturing an inner cutter for an electric shaver Download PDF

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Publication number
US20050199096A1
US20050199096A1 US11/081,105 US8110505A US2005199096A1 US 20050199096 A1 US20050199096 A1 US 20050199096A1 US 8110505 A US8110505 A US 8110505A US 2005199096 A1 US2005199096 A1 US 2005199096A1
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US
United States
Prior art keywords
inner cutter
cutter
portions
thin plate
manufacturing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/081,105
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English (en)
Inventor
Masaki Okabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Izumi Co Ltd
Original Assignee
Izumi Products Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Izumi Products Co filed Critical Izumi Products Co
Assigned to IZUMI PRODUCTS COMPANY reassignment IZUMI PRODUCTS COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OKABE, MASAKI
Publication of US20050199096A1 publication Critical patent/US20050199096A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/02—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the reciprocating-cutter type
    • B26B19/04—Cutting heads therefor; Cutters therefor; Securing equipment thereof
    • B26B19/044—Manufacture and assembly of cutter blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B23P15/40—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools shearing tools
    • B23P15/403—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools shearing tools razor blades
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/02—Local etching

Definitions

  • an inner cutter makes a reciprocating motion while making sliding contact with the inside surface of an arch-form outer cutter, and hair that enters openings (hair introduction openings) formed in the outer cutter is cut by the reciprocating inner cutter, as seen in, for instance, Japanese Patent Application Publication (Kokoku) No. S59-32151 and Japanese Patent Application Laid-Open (Kokai) Nos. S59-101182 and H10-323461.
  • the inner cutters used in such electric shavers of this type include assembled type inner cutters and integral type inner cutters.
  • a plurality of cutter blades formed by stamping a thin plate(s) into an arch-form shape are held on an inner cutter holder with these cutter blades lined up at fixed intervals as disclosed in Japanese Patent Application Publication (Kokoku) Nos. S59-32151 and Japanese Patent Application Laid-Open (Kokai) No S59-101182.
  • Kokoku Japanese Patent Application Publication
  • Korean Japanese Patent Application Laid-Open
  • the number of manufacturing processes is large, and the productivity tends to be poor.
  • the integral type inner cutter which is typically made of a single metal cylinder or sheet, all of the cutter blades are integrally formed. More specifically, perpendicular slits are formed in a cylindrical body made of a metal, ceramic or the like, and the portions that remain between the slits are used as cutter blades.
  • a thin plate is bent into an arch-form shape, and cutter blades are formed by making slits in the perpendicular direction with respect to the axis of the arch-form portion.
  • a thin plate in which slits have been made is bent into an arch-form shape as shown in Japanese Patent Application Laid-Open (Kokai) No. H10-323461.
  • the sharpness of inner cutters conspicuously improves by forming the rake angle formed on the cutting edges of the cutter blades in an acute angle.
  • the rake angle is the angle defined by the blade surface, where a cutter blade makes sliding contact with the outer cutter, and the side surface, which is connected with the cutting edge of the cutter blade.
  • the respective cutter blades are integrally formed or they are formed on a single cylindrical body or on a single arch-form thin plate; accordingly, it is generally difficult to form the rake angle into an acute angle. Nevertheless, various methods for making the rake angle into an acute angle for integral type inner cutters have been introduced.
  • the reference numeral 10 is a thin plate that will make the inner cutter.
  • a contour of an unfolded or extended inner cutter and a plurality of slits 12 that extend in the direction perpendicular to the reciprocating (or lateral) direction (shown by arrow a) of the inner cutter are press-stamped from a thin plate of, for instance, quenchable stainless steel.
  • FIG. 14A is a top view of the thin plate 10
  • FIG. 14B is a sectional view taken along the centerline 14 of the thin plate 10 of FIG. 14A .
  • the flat plate 10 shown in FIGS. 14A and 14B is placed on the lower mold 22 .
  • the upper mold 24 is formed with grooves 26 which have substantially the same length as the bridging-portions 20 and which have a width that is narrower than the width of the bridging-portions 20 ; and the grooves 26 are positioned so as to correspond to the respective bridging-portions 20 .
  • Beveled faces 28 that are substantially triangular in cross section are formed in the opening corner of the grooves 26 .
  • the bridging-portions 20 When the bridging-portions 20 are pressed by the molds 22 and 24 , the bridging-portions 20 undergo plastic deformation from the state shown in step (A) to the states shown in steps (B), (C) and (D).
  • the following description on making the rake angles into an acute angle for the bridging-portions 20 will be made only for one bridging-portion 20 though such a process is made for all the bridging-portions simultaneously.
  • the thin plate 10 thus makes an intermediate worked member 32 in which, as shown in FIG. 14C , all the bridging-portions 20 are pressed into a cross-sectional shape that is substantially the shape of an inverted T or an inverted umbrella.
  • the bridging-portions 20 of this intermediate worked member 32 make the ribs 20 A that have protruding portions 30 .
  • FIGS. 16A and 16B show the manufacturing process of an integral type inner cutter according to an etching method (see the above-identified Japanese Patent Application Publication (Kokoku) No. S59-22542).
  • the etching is performed from one side; and in FIG. 16B , the etching is performed from the both sides.
  • resists 36 are formed on one surface (the upper surface) of a thin plate 34 in positions that correspond to the bridging-portions 20 (see FIG. 14A ), and slits 38 are worked by performing etching with a jet of etching liquid applied from the upper surface as indicated by arrows e.
  • the resists 36 are formed by coating the entire surface with a resist or pasting a dry film of the resist to the entire surface and then exposing a pattern and removing the unnecessary resists (photo-etching method).
  • the method in which etching is thus performed from one side or from one surface takes a longer time to form the slits 38 , thus increasing the working time.
  • slits 38 are ground using grindstones 46 that are fastened to a rotating shaft that is rotated as shown by circular arrow and are parallel (horizontal) to the thin plate 34 .
  • the outer circumferential edges of the grindstones 46 are beveled to a substantially trapezoidal shape in cross section so that each grindstone is shaped to be thinner outward.
  • a rake angle of ⁇ is formed in positions that correspond to the outer circumferential sides of the grindstone 46 on the bridging-portions 40 that remain between the slits 38 .
  • the cutter blades 58 of FIG. 18B when it is attempted to increase the thickness i, the plating time increases, and the mass production characteristics deteriorate. Furthermore, it also becomes difficult to reduce the rake angle ⁇ . Moreover, there are restrictions on the materials that can be used for the thin plate. Ordinarily, the material used is Ni, Ni-cobalt or the like, so that the degree of freedom in selecting materials is restricted.
  • the present invention is to overcome the above-described problems, and it solves at one time the various problems encountered in the conventional methods.
  • the above object is accomplished by unique steps of the present invention for a method for manufacturing an inner cutter for a reciprocating electric shaver in which an integral inner cutter makes a reciprocating motion while causing a plurality of cutter blades thereof to make sliding contact with the inside surface of an arch-form outer cutter; and in the present invention, the method includes the steps of:
  • the thin plate can be formed so as to have a contour of an intended inner cutter in step (a).
  • the contour is made by etching.
  • the contour or external shape can also be made by stamping when pressing is performed in step (b).
  • step (a) is performed on a large thin plate for a plurality of inner cutters, and the resulted plurality of intermediate worked members are simultaneously formed in step (b); accordingly, the productivity is high.
  • step (a) It is advisable to use photo-etching in step (a). With photo-etching, high-precision working is easily performed. Furthermore, by way of executing etching from both sides (or both surfaces) of the thin plate, the time of the etching treatment can be shortened. However, etching can be performed from only one surface (the opposite surface from the blade surface). In this case, though it takes longer processing time, the amount of deformation caused by the pressing in step (b) can be greatly reduced, thus enhancing the advantages of the present invention. Some other method such as electrolytic working, laser beam working or the like can be used instead of photo-etching.
  • FIG. 1 is a schematic front view of a reciprocating electric shaver for which the inner cutter of the present invention is adapted to be used;
  • FIG. 2 is a schematic side view thereof
  • FIGS. 3A through 3E shows process of manufacturing method for the inner cutter according to the present invention
  • FIG. 4 shows the steps of the manufacturing process of the inner cutter of the present invention
  • FIG. 10 is a top view of the inner cutter of still another embodiment of the present invention unfolded
  • FIG. 13A is a top view of the inner cutter of still further embodiment of the present invention unfolded, and FIG. 13B is an enlarged view of the cutter blades thereof;
  • FIG. 15 shows in detail the manufacturing steps (A) through (D) of the cutter blades thereof;
  • FIG. 18A shows the manner of manufacturing an inner cutter in a conventional electro-casting
  • FIG. 18B illustrates the completed inner cutter.
  • FIG. 1 shows schematically the internal structure of a reciprocating type electric shaver according to one embodiment of the present invention, the internal structure of the shaver being omitted; and FIG. 2 shows the shaver from the side.
  • the inner cutter 102 is driven in a reciprocating motion by an electric motor 106 .
  • a plane oscillator 110 made of a synthetic resin is suspended from the upper end surfaces of a pair of supporting columns 108 that extend in an upright attitude from the frame 104 of the shaver so that the oscillator 110 is free to oscillate laterally (or to the left and right), and a crank pin 112 that is fastened to the rotating shaft of the motor 106 is engaged with a long groove formed in the oscillator 110 .
  • the oscillator 110 makes a lateral (or left and right) reciprocating motion.
  • a supporting column 114 is provided so as to protrude from this oscillator 110 , and a holding portion 116 for the inner cutter 102 is held on the supporting column 114 .
  • the holding portion 116 is guided by the supporting column 114 so that the holding portion 116 is free to make an upward and downward motion; and a return inertia oriented in the upward direction toward the outer cutter 100 is applied to the holding portion 116 by a coil spring 118 .
  • the inner cutter 102 is driven in a reciprocating motion by the motor 106 while being held in elastic contact with the inside surface of the outer cutter 100 by the coil spring 118 .
  • the reference numeral 120 indicates a thin plate made of stainless steel or the like.
  • Patterns (as shown in FIG. 8 , for instance) of the inner cutter 102 are formed by photo-resists 122 and 124 on both sides (on both surfaces) of this thin plate.
  • the resists 122 and 124 are formed by applying a coating of a resist liquid or pasting a dry film (see step S 200 in FIG. 4 ), exposing the pattern of the inner cutter 102 (step S 202 ), and developing the exposed pattern (step S 204 ).
  • the resists in the portions corresponding to the slits 126 are removed.
  • the resists 122 and 124 cover the portions that will become both side edges 128 (see FIG. 8 ), the bridging-portions 130 and the claws 132 .
  • the thin plate 120 on which the resists 122 and 124 are formed is etched from both sides (surfaces) as show in FIG. 3B . More specifically, etching is performed by applying a jet of etching liquid to both sides (or both surfaces) simultaneously or one at a time, so that the slits (grooves) 126 are formed. Since the etching liquid etches only places where there is no resist 122 or 124 , the slits 126 are formed between the resists (step S 206 ).
  • Etching proceeds in the direction of thickness of the thin plate 120 from the gaps between the resists 122 and from the gaps between the resists 124 ; accordingly, the worked wall surfaces that define the slits 126 are uneven or inclined with respect to the direction of depth as shown in FIG. 3B , taking substantially an arc shape in cross section to have curved surfaces. Since etching is performed on both sides of the thin plate, slits are defined by uneven or arc shaped wall surfaces on their both sides with the wall surfaces having protruding strips 134 . Since these protruding strips 134 later make the protruding portions 144 when the pressing working is executed, it is desirable that these protruding strips 134 be formed in positions close to the protruding portions 144 .
  • the amount of etching liquid that is applied is set at a larger amount on the front upper side (or upper side in FIG. 3B ) of the thin plate, and at a smaller amount on the back (or lower) side. It is also possible that the width of the resist 122 on the front side be set at a width that is narrower than the width of the resist 124 on the back side.
  • the position j of the dot symbol in the vicinity of the protruding strip 134 shown in FIG. 3B is caused to move into the protruding portions 144 by the pressing work; however, the amount of this movement is extremely small. In other words, the amount of plastic deformation is small. Accordingly, braking and cracking do not tend to occur internally.
  • the outer circumferential surface of the intermediate worked member 102 B that has thus been deep drawn into an arch-form shape as shown in FIG. 5 is ground and finished (step S 216 ) after being quenched (step S 214 ).
  • the ribs 130 A formed after the pressing work of the bridging-portions 130 make cutter blades 130 B, as seen in FIG. 6 , that has blade surfaces 154 on the outer circumferential surfaces. Both edges of the blade surfaces 154 of these cutter blades 130 B protrude in the form of eaves, and the tip ends of these eaves form cutting edges 156 .
  • the rake angle ⁇ of the cutting edges 156 is an acute angle.
  • the inner cutter 102 c shown in FIG. 11 has a plurality of bent regions (three bent regions) p, q and r that are different in inclinations with respect to the reciprocating (lateral) direction of the inner cutter 102 c .
  • the cutter blades are inclined and the inclination of adjacent cutter blades 130 c varies slightly next to each other; and in the other regions p and r at both ends, the cutter blades are perpendicular to the reciprocating (lateral) direction of the inner cutter. Accordingly, when adjacent cutter blades 130 c within the region q cut across the same hair introduction opening of an outer cutter, these cutter blades contact the same hair at different angles, so that the positions of the opening edges of the outer cutter contacted by the hair are varied. As a result, it is possible to extend the useful life of the outer cutter and to improve the sharpness.
  • the deformed portions 162 ′ of the cutter blades 130 d ′ in the left half of FIG. 12A have a substantially diamond ring shape as shown in FIG. 12C .
  • the shapes of the cutter blades 130 d and 130 d ′ are different in the right half and left half; however, this is mere an example of two different shapes that can be taken as the shape of the deformed portions in the cutter blades.
  • FIG. 13A shows the unfolded inner cutter 102 e of still another embodiment of the present invention
  • FIG. 13B is an enlarged view of a part of the cutter blades 130 e and 130 e ′ of this inner cutter 102 e
  • the cutter blades 130 e are in a rectilinear shape that is perpendicular to the reciprocating (lateral) direction of the inner cutter 102 e
  • the other cutter blades 130 e ′ are formed with deformed portions 164 in an oval ring shape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Dry Shavers And Clippers (AREA)
US11/081,105 2004-03-15 2005-03-14 Method for manufacturing an inner cutter for an electric shaver Abandoned US20050199096A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-072614 2004-03-15
JP2004072614A JP2005253856A (ja) 2004-03-15 2004-03-15 往復式電気かみそりの内刃製造方法

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US20050199096A1 true US20050199096A1 (en) 2005-09-15

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US11/081,105 Abandoned US20050199096A1 (en) 2004-03-15 2005-03-14 Method for manufacturing an inner cutter for an electric shaver

Country Status (6)

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US (1) US20050199096A1 (zh)
EP (1) EP1582316A3 (zh)
JP (1) JP2005253856A (zh)
CN (1) CN100448604C (zh)
CA (1) CA2500634A1 (zh)
MX (1) MXPA05002744A (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050155230A1 (en) * 2004-01-15 2005-07-21 Izumi Products Company Method for manufacturing an inner cutter of a reciprocating electric shaver and an inner cutter of a reciprocating electric shaver
US20170050326A1 (en) * 2015-08-20 2017-02-23 Specialife (Zhuhai) Co., Ltd. Personal care trimmer having ultrathin fixed blade and manufacturing method for ultrathin fixed blade

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4919279B2 (ja) * 2007-02-01 2012-04-18 九州日立マクセル株式会社 回転式内刃を備えている電気かみそり
CN101187025B (zh) * 2007-11-28 2011-04-06 韩祖强 一种错位双面蚀刻的刨片加工方法
JP5435552B2 (ja) * 2009-05-15 2014-03-05 日立マクセル株式会社 電気かみそり
JP5435553B2 (ja) * 2009-05-27 2014-03-05 日立マクセル株式会社 電気かみそり
EP3238895B1 (en) * 2016-04-27 2019-01-23 Braun GmbH Blade, shaver with a blade and method for producing a blade
DE102019100424A1 (de) * 2019-01-09 2020-07-09 Micrometal GmbH Herstellung von geätzten Strukturen aus einem Stahlwerkstoff

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US2735390A (en) * 1956-02-21 Harris
US5079394A (en) * 1989-06-30 1992-01-07 Elektro-Apparatebau Olten Ag Snap action switch and contact therefor
US5200025A (en) * 1990-09-20 1993-04-06 Dainippon Screen Manufacturing Co. Ltd. Method of forming small through-holes in thin metal plate
US6193897B1 (en) * 1996-07-02 2001-02-27 Kabushiki Kaisha Toshiba Shadow mask manufacturing method, shadow mask manufacturing apparatus, and cleaning device used in the method and apparatus
US20020026857A1 (en) * 2000-07-03 2002-03-07 Andreas Peisert Method for the manufacturing of a saw blade
US20040006863A1 (en) * 2001-09-10 2004-01-15 Ryuji Otani Method of manufacturing inner blade for electric razor
US20060127690A1 (en) * 2003-01-17 2006-06-15 Ryuji Ueda Metal photo-etching product and production method therefor

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JPS5932151B2 (ja) * 1976-01-30 1984-08-07 日立マクセル株式会社 電気かみそり
JPS5922542B2 (ja) * 1976-06-18 1984-05-28 三洋電機株式会社 振動式電気かみそりの内刃製造法
JPS59101182A (ja) * 1982-11-30 1984-06-11 松下電工株式会社 電気かみそり
JPH10323461A (ja) * 1997-03-28 1998-12-08 Tec Corp 往復動式切断手工具の内刃とその製造方法
AU2003203088A1 (en) * 2002-02-07 2003-09-02 Browne And Co. Ltd. Non-symmetrical photo tooling and dual surface etching

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
US2735390A (en) * 1956-02-21 Harris
US5079394A (en) * 1989-06-30 1992-01-07 Elektro-Apparatebau Olten Ag Snap action switch and contact therefor
US5200025A (en) * 1990-09-20 1993-04-06 Dainippon Screen Manufacturing Co. Ltd. Method of forming small through-holes in thin metal plate
US6193897B1 (en) * 1996-07-02 2001-02-27 Kabushiki Kaisha Toshiba Shadow mask manufacturing method, shadow mask manufacturing apparatus, and cleaning device used in the method and apparatus
US20020026857A1 (en) * 2000-07-03 2002-03-07 Andreas Peisert Method for the manufacturing of a saw blade
US20040006863A1 (en) * 2001-09-10 2004-01-15 Ryuji Otani Method of manufacturing inner blade for electric razor
US20060127690A1 (en) * 2003-01-17 2006-06-15 Ryuji Ueda Metal photo-etching product and production method therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050155230A1 (en) * 2004-01-15 2005-07-21 Izumi Products Company Method for manufacturing an inner cutter of a reciprocating electric shaver and an inner cutter of a reciprocating electric shaver
US7243576B2 (en) * 2004-01-15 2007-07-17 Izumi Products Company Method for manufacturing an inner cutter of a reciprocating electric shaver and an inner cutter of a reciprocating electric shaver
US20170050326A1 (en) * 2015-08-20 2017-02-23 Specialife (Zhuhai) Co., Ltd. Personal care trimmer having ultrathin fixed blade and manufacturing method for ultrathin fixed blade

Also Published As

Publication number Publication date
CN100448604C (zh) 2009-01-07
CN1672864A (zh) 2005-09-28
CA2500634A1 (en) 2005-09-15
JP2005253856A (ja) 2005-09-22
MXPA05002744A (es) 2005-09-20
EP1582316A2 (en) 2005-10-05
EP1582316A3 (en) 2006-03-22

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Owner name: IZUMI PRODUCTS COMPANY, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OKABE, MASAKI;REEL/FRAME:016388/0085

Effective date: 20050303

STCB Information on status: application discontinuation

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